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Editorial Team
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Asked: 2026-05-28T06:27:28+00:00

In a HTTP POST multipart-form content-type stream, what do the long ————- lines means?

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In a HTTP POST multipart-form content-type stream, what do the long ————- lines means? What is hex encoded as the end of these lines? Can you figure out the length of the variables from them? Or is this a specially designed sequence so you can find the break between variables?

-----------------------------7dc34719970524 
Content-Disposition: form-data; name="my variable" 

blah content here
-----------------------------7dc34719970524 
Content-Disposition: form-data; name="asdfasdf"

heaps of data here
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1 Answer

  1. Editorial Team

    It is a boundary that is used to separate the different sets of data in case of a multi-part data submission. Read more about it:

    http://www.w3.org/Protocols/rfc1341/7_2_Multipart.html

    To quote from the link:

    In the case of multiple part messages, in which one or more different sets of data are combined in a single body, a “multipart” Content-Type field must appear in the entity’s header. The body must then contain one or more “body parts,” each preceded by an encapsulation boundary, and the last one followed by a closing boundary. Each part starts with an encapsulation boundary, and then contains a body part consisting of header area, a blank line, and a body area. Thus a body part is similar to an RFC 822 message in syntax, but different in meaning.

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